Can you explain certain rules which you follow in doing link building?

Can you explain certain rules which you follow in doing link building?

Yes, I use many specific rules to define the quality of links. I will look at following factors before submission :

Quality of back link(PR, PA, DA must be good)
Relevancy of the content between 2 sites
Proper use of anchor text
Avoid site-wide links
Avoid links from low-quality sites